Wheelbarrows were invented around 200 CE. The Chinese before that used two-wheeled carts to get items around their rice paddies. But the two-wheeled carts tended to slip off the narrow pounded-earth walls which separated flooded rice fields. Someone, somewhere, had the idea of putting just one big wheel under the cart. Suddenly rice paddy embankments were easier to get around. The wheelbarrow was a hit! Besides being used by farmers, the Chinese military soon adopted wheelbarrows to transport supplies and dead and wounded soldiers.
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